Heart rate belt



FIG. 1 is a perspective view of a heart rate belt according to a new design;

FIG. 2 is a top view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is an end view thereof;

FIG. 7 is another end view thereof; and,

FIG. 8 is a perspective view thereof with the top portion removed for clarity of the illustration. 

CLAIM The ornamental design for a heart rate belt, as shown and described. 